MDAC 2.5 SDK - ODBC Programmer's Reference
Chapter 16: Interoperability
Some databases, especially desktop databases such as dBASE, Paradox, and Btrieve, do not support transactions. Even among databases that support transactions, there is variation in what kinds of SQL statements can be in a transaction. For more information, see the SQL_TXN_CAPABLE option in the SQLGetInfo function description.